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American Fork, Utah, has two diverging diamonds, and an engineering services manager says they are easy to navigate, even if they do put drivers on the wrong side of the road.
The Roanoke Times | File 2011
Construction on the Interstate 581-Valley View Boulevard interchange expansion could begin this fall and is expected to conclude in mid-2016.]
The Roanoke Times
Getting through the new I-581 interchange at Valley View Boulevard will mean following a new kind of traffic pattern that will briefly put drivers on what’s usually the wrong side of the road. Here’s how it works: If you’re driving from Valley View Mall and want to head downtown (that is, following the yellow arrows), you’ll come to a brand new light just before the overpass. If it is green, you’ll proceed down the left hand side of the highway overpass in order to reach the on ramp for the highway. If it is red, you’ll have to wait for traffic coming off the new exit ramp off of southbound I-581 to pass and get onto Valley View – the blue arrows. Eventually, when the Evans Spring area on the other side of I-581 is developed, there will be still more traffic coming through the crossover.
Wednesday, March 27, 2013
The planned expansion of the Valley View Boulevard interchange on Interstate 581 now has a price tag, a contractor and an unusual new design.
The Virginia Department of Transportation awarded the $38.4 million design-build contract for the project to The LANE Construction Corp., the agency announced today.
Chantilly-based LANE will complete a final design for the interchange, acquire rights of way for the new ramps and build them.
Construction could start as soon as this fall and is to be finished in mid-2016.
The work includes building a new exit ramp from southbound I-581 to Valley View Boulevard as well as a new entrance ramp from boulevard onto northbound I-581.
The interchange will use a “diverging diamond” design. That means that traffic on the Valley View Boulevard overpass over the interstate will cross over to briefly travel on what is usually the wrong side of a road.
For instance, traffic headed south on Valley View and then heading to downtown Roanoke on Interstate 581 would travel on the left hand lanes of the overpass to reach the ramp. Traffic lights on the road and at the end of the exit ramp off I-581 would control traffic and keep vehicles from colliding
Drivers headed north on a new road connecting to the overpass, and seeking to head north on I-581 towards I-81 would also cross over to what would be their left in order to reach the ramp for northbound I-581.
The diverging diamond interchange was listed by Popular Science magazine as one of the best engineering innovations of 2009.
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